Photos of extremely muscular pigs bred by a farm in Cambodia have been doing the rounds online, sparking controversy about genetically modified animals.

The Hulk-like pigs are apparently bred by Duroc Cambodia, a pig farm in the Asian country’s Banteay Meanchey province. The company’s Facebook page is littered with photos and videos of these freakishly muscular animals that appear to be the result of some extreme genetic tampering. Some have accused the breeder of using hormones and steroids to turn the pigs into nightmarish monsters, but seeing as Duroc Cambodia is also selling insemination kits to people wanting to grow their own, their unnatural physique is most likely caused by genetic modifications.

Duroc Cambodia has been sharing updates on the incredibly muscular pigs since December of last year, including videos of the animals struggling to walk under the weight of all that muscle mass and trying to keep their heads up. Apart from the huge muscles, the males also have enormous testicles.

Photos of the mutant pigs recently went viral online, leaving most social media users furious.

“This breaks my heart how many people don’t give a flying f**k about animals and how they are treated,” one person wrote on Facebook.

“This is disgusting!!! Those poor pigs can’t even hold their heads up s**t looks painful af if you ask me!!! This is HORRIBLE,” another commented.

Animal rights group PETA also condemned the practice, stating “Hulk-like pigs are the stuff of nightmares, not meals, and those who are genetically engineered are also likely to be born with painful health issues. Pigs suffer even without this “Frankenscience”. On typical pig farms, their tails are cut off, their sensitive teeth are ground down, and the males are castrated, all without so much as an aspirin.”

The desire for freakishly large muscles in pigs is believed to be fueled by greed, as breeders look to maximize their profits by artificially increasing the amount of meat per animal. A similar case made headlines in 2015, when scientists in China and South Korea created double-muscled piglets.

Double-muscling is also practiced in cattle, with the Belgian Blue breed being known as the “bodybuilders of the bovine world”.